Anisotropic Optical Properties of Layered Germanium Sulfide
Dezhi TanHong En LimFeijiu WangNur Baizura MohamedShinichiro MouriSandhaya KoiralaWenjing ZhangYuhei MiyauchiMari OhfuchiKazunari Matsuda
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Two-dimensional (2D) layered materials, transition metal dichalcogenides and black phosphorus, have attracted much interest from the viewpoints of fundamental physics and device applications. The establishment of new functionalities in anisotropic layered 2D materials is a challenging but rewarding frontier, owing to their remarkable optical properties and prospects for new devices. Here, we report the anisotropic optical properties of layered 2D monochalcogenide of germanium sulfide (GeS). Three Raman scattering peaks corresponding to the B3g, A1g, and A2g modes with strong polarization dependence are demonstrated in the GeS flakes, which validates polarized Raman spectroscopy as an effective method for identifying the crystal orientation of anisotropic layered GeS. Photoluminescence (PL) is observed with a peak at around 1.66 eV that originates from the direct optical transition in GeS at room temperature. Moreover, determination of the polarization dependent characteristics of the PL and absorption reveals an anisotropic optical transition near the band edge of GeS, which is also supported by the density functional theory calculations. This anisotropic layered GeS presents the opportunities for the discovery of new physical phenomena and will find applications that exploit its anisotropic properties.Keywords:
Optical anisotropy
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Abstract Few‐layered black phosphorus (BP) is known to be oxidized easily in the air which causes property degradation. However, the optical anisotropy of oxidized BP is yet to be well determined. Here, the optical anisotropy of the oxidized BP is revealed by continuous measurement of ambient exposed BP flake over a month using azimuth‐dependent reflectance difference microscopy. The isotropic oxidization process is elucidated by both the disappeared optical anisotropy of oxidized residuals and the unchanged crystalline orientation during BP oxidization. Unlike the severe degradation of electrical conductivity for oxidized BP within hours, the optical anisotropy is rather insensitive to the oxidization. The optical anisotropy of a oxidized BP could remain constant even days because of the isotropic optical properties and low coverage of the oxidized species at initial stage. Furthermore, when the oxidization spots grow, forming an effective layer, the oxidization layer modulates the total optical anisotropy via optical interference, which might result in an increased or decreased optical anisotropy compared with the fresh one. These results shed light on the oxidization impact on optical anisotropy and suggest a new method of manipulating optical anisotropy by controlling the degree of oxidization.
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Abstract Die Titelverbindungen werden durch Umsetzen von GeX 4 (X: Br, I) mit H 2 S in CS 2 dargestellt und röntgenographisch untersucht.
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